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Finding the Fourth Proportional to 722.98, 998.20 and 554.63

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Solution

The fourth proportional to 722.98, 998.20 and 554.63 is: 765.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.98 : 998.20 = 554.63 : x
  2. Step 2: Convert to fraction form
    722.98/998.20 = 554.63/x
  3. Step 3: Cross multiply
    722.98x = 998.20 × 554.63
  4. Step 4: Simplify right side
    722.98x = 553,639.14
  5. Step 5: Solve for x
    x = 553,639.14/722.98
  6. Step 6: Final answer
    x = 765.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.